Integrated-intensity ratios, (W_mol/W_CH3OH)/(W_mol/W_CH3OH)_max, of various molecular transitions with either CH₃OH 10_2,9−9_3,6 (E_u = 165 K; for HC₃N and CH₃CN) or 5_1,4−4_2,2 (E_u = 5β K; for D₂CO, DCN, HNCO, and CH₃CHO) towards the IRAS 4B1 outflow. Integrated intensities contain the sum of blue- and redshifted emission (see Fig. A.3 and the spectra in Fig. A.1). The ratio is only shown when both molecules are above a 5σ threshold, where σ is the noise level in the respective map. Another mask with a 1" radius around the protostar is applied to the ratios. The black contours show the integrated intensities of CH₃OH, starting at −5σ, 5σ, and then increasing by a factor of 2, where σ = 0.34 K km s⁻¹. The molecule as well as the upper-level energy of the shown transition are plotted in the top left corner. In all panels, the white star marks the position of IRAS4B1. The HPBW is shown in the bottom left corner and black crosses mark H₂ knots (Choi & Lee 2011). Spectroscopic information on the shown transitions is given in Table A.1.